[clang] [llvm] [mlir] Move several vector intrinsics out of experimental namespace (PR #88748)

[Benjamin Maxwell via cfe-commits]

MacDue wrote:

> @c-rhodes the remaining failure is MLIR :: Conversion/TosaToTensor/tosa-to-tensor.mlir but it also fails without my changes.

Very likely unrelated we only added `interleave2` for use in ArmSME. It's not used within high-level dialects like tosa & tensor. 

https://github.com/llvm/llvm-project/pull/88748